If wavelength increases, frequency would ?

decreases

Explanation:

When frequency

increases more wave crests pass a fixed point each second. That means

the wavelength shortens. So, as frequency increases, wavelength

decreases. The opposite is also true—as frequency decreases,

wavelength increases.

distance = 150m

displ = root (50 ^2 + 100^2)

root(2500+10000)

root 125000